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Apera SX823-B Portable pH / Conductivity Meter
GOWE pH + Conductivity Double-Parameter measurement meter Lab pH/Conductivity Meter -1.99 ~ 19.99 - - Amazon.com
Pro1030 pH and Conductivity Meter | ysi.com
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Apera Instruments PC910 Benchtop pH/Conductivity Multiparameter Meter Kit with Dual-Channel Simultaneous pH/cond. Measurement: Amazon.com: Industrial & Scientific